My Wife Has Been Diagnosed With Bacteria Pneumonia. She Had

My wife has been diagnosed with bacteria pneumonia. She had been bedridden for several days but on Friday, after bouts of diarrhea, she was feeling much better. However, I thought it best to take her to emergency room at Sutter Hospital. After the diagnosis, she was given 3 tablets of Levofloxacin (total of 750 mg) with instruction to take a 750 mg every 24 hours for 5 days. (I have read enough to realize this is common for her condition.) I noticed some regression in her behavior after the pills administered in the hospital - excessive tiredness returned - and she did complain of weird or nasty hallucinations. (What also troubled me was that she told me of experiencing trouble trying to do her hair; lifting her arms was extremely difficult.) However, she took the second pill (750 mg) at 5 pm (24 hours after the first three) and soon thereafter she started to feel stomach discomfort and nausea. Not long after, she vomited (lots). I found her lying on the bathroom floor. I contacted the emergency room - they couldn't help unless I brought her in (it was around 7 pm) - and then an online nurse. But ill as she was, she did not want to go. So we didn't. Today, she has been in bed to now (2:30 pm) and I want her to return to the ER (it is Saturday) but she is afraid they will give her the same medication. Three or four questions then: can we refuse the Levofloxcin and will it be too detrimental to do so? If the ER insists, should we request a lower dosage? And lastly, and most importantly, are there alternatives to Levlfloxcin that she might be given that might work (almost) as well but without the nasty side effects?